356 P>'of. T. Rupert Jones and James W. Kirhby — 



The species is found near Girvan, Ayrslure. in a Lower Silurian 

 stratum ; and in an Upper Silurian bed near Kendal, whence there 

 is a specimen now in the British Museum. 



With regard to caudal spines appertaining to these little Apudi- 

 form Crustaceans, we have not much to remark. At Skelgill, in the 

 Upper Silurian (Coniston) mudstone, in which specimens of Dis- 

 cinocaris and Peltocaris occur, Mr. J. E. Marr found a small tapering 

 caudal spine, 15 mm. long, and delicately striate. This may have 

 belonged to one of the forms just mentioned. So also a small 

 tail-spine in the British Museum from the Eiccarton beds (Upper 

 Silurian) of Shankend, near Hawick, probably belonged to an 

 Aptychopsis ; also two larger spines (apparently two of a set of 

 three), one 35 mm. and the other 20 mm. long, are in the British 

 Museum from the Buckholm bed of the Gala group (Upper 

 Silurian), Meigle Hills, Galashiels. These are large enough for 

 a small Ceratiocnris, but AptycJiopsis only is known in these strata. 



"We may add that a few similar caudal spines (one 20 mm. long) 

 have been found by Mr. Marr in the Upper Arenig Slates at Port 

 Seiont near Caernarvon. Here they are associated with Caryocaris. 



VI. — On Some Carboniferous Entomostraoa from Nova Scotia. 



By T. EuPERT Jones, F.R.S., and James "W. Kirkby, Esq. 



(PLATE XII.) 



THE Entomostraca that form the subject of the following remarks 

 ai-e from the Carboniferous rocks of Nova Scotia, and were 

 submitted to us for examination, at different times, by Principal Dr. 

 J. W. Dawson, C.M.G., F.R.S., of McGill College, Montreal. 



Certain of them are from the Lower Coal-measures of Horton, 

 strata equivalent, probably, to the Sub-Carboniferous of Dana, and 

 the Lower Carboniferous and Mountain-limestone series of British 

 geologists. 



Other specimens are from the Middle Coal-measures of the 

 Joggins ; and others are from the Upper Coal-measures of the 

 South Joggins ; both of which groups of strata are perhaps near 

 representatives, in time, of the Coal-measures of Great Britain. 



Altogether we have made out ten or eleven species and varieties, 

 which are figured in the Plate accompanying this paper, and on 

 which we proceed to make the following notes. 



1. — Leperditia Okeni (Miinster). Plate XII. Eig. 3. 



1. Oheni (Miinster), Jones and Kirkby, Ann. Mag. Nat. Hist. ser. 3, vol. xv. 1865, 

 p. 406, pi. 20, figs. 1—3 ; and ser. 4, vol. xv. p. 64, pi. 6, fig. 1. 



The most common forms from the Lower Coal-measures of Horton 

 belong to the very wide- spread and abundant species, Leperditia 

 Olteni (Miinster). Some of our specimens received from this locality 

 were separately mounted on cardboard ; others occur plentifully in 

 hand-specimens of hardish grey shale, where they are associated 

 with species of Beyrichia and Cy there (?), hereafter noticed. Some- 

 what the lesser number of them are easily recognizable as typical 



